Tube-cutting machine



1,698,261 H. DE SMITH ET AL '11mm CUTTING MACHINE Filed-June 24, 1927 4 sheets-sheet 1 Jan. 8, 1929.

I ATTORNEYS.

Jan; 8, 1929.

H. DE SMITH ET AL TUBE CUTTING MACHINE med June 24, '1927 .4 sheets-sheet 2 ATTORNEYS. y

Jan. 8,1929'. l

H. DE sMl'rH ET AL TUBE GUTTINGMACHINE Filed June 24, 1927 QR BY ATTORNEYS.

Jam 8, 1929. 1,698,261

H. DE sMrrH ET Az.

TUBE CUTTING MACHINE Filed June 2 4, 1927 4 Sheets-Sheet 4 BY MN' A 'x I .n-M

* ETTORNEYS.

Seymour No. 1,626,8178, dat@ eliinee with ineens ici' ii Patented Jen. 8, lgf,

HENRY DE SMITH AND BEI' e M. D. KOi/VBTN COMPAM A YORKQ application le Enne 34-,

The inventimi relates to inuelisgee im: ouin. ting tnbing, :toinied ei. pupei oi' like nietei'iul, into lengtlie, more eepeciellytc inueliiues of t-lie generaal type ellen/'n in t1 z, ent to and llas ier. iteobjeet te pievi" ueeni'uteiy determinand effect-ing' the ei ci' Se ene of unioi'in length iii-oni tubi "d centi loi ,f

elec previene inlieliine. mieeii Fie'. 3 is e iiiuggnientuiy elevation il- 'l I il@ ef l1 ign l. h Y v u Fig. 5 a plain view with eeiftein o the puits emitted te evoid ceniueion.

Fig. is a. p-ii'tiul sectional end. ,elgwutien' l on un enlarged eeele.

Fig. 7 is u. side elevation oit the ,parte shown dla. O. u [n i Y 8 is u i 1 View ei the suine. Figi; 9 ie a` ilieqinentmy einen teil 0i the sew iiznne with thelnteliing` end letiueting ineens 'tlieieioiz The' @Deletion ef 'tube cutting ineel'iinee 01"" the general type disclosed in 'the pute-nt nii( "e Suid Ainvelvee :i Const-unt speed et i een" i,v eene! t Vance. end @if l nii tli-e Senf' vrijli the tubing; i?, whereas; the i' of? deli \f'i\ij.f ci thetubing te tlie um elli ein. .rv il :fsncli delivery is frein e ytube leuning;

i Winding nmcliiue', vui'iee Widely, duev toV teiiipeiuiiie und Went/hei conditiene page of 'the Winding belt, the ein" peper und adhesive employed, and tlie size of the tubing'u fist-lie result et tl variance' in the rate olf the feed et the tubing tliieugli tlienieeliine, it ie practically impossible cut sections ci regulr and uuiifoiin lengtlie unlees eneciulinezuis are picvided te ceinpen'- sate i'ei" the variations in the yate eik tievel el'eeed in'tlie Seymour patent aforesaid loeeely time interval between the inoef inentei ille target oi' trip pluto luy the iid-f ne tubing); und the enfgniijenxeut y Legein we?. seliiiai no. 291,189.

of .the tubing tlii'ongli the machine during the cutting epei'a'tion, and it is the pii'iineiy purpeseof the-instant invention to effect this compensation by the provision O'ineens for untoineticelly locking' Vthe emv to tlieftiip niecliuniein during the initial movement of the lut-tento eiiieet lie projection et the Suv? linte engagement with. the tubing, und to ie- Said lee-king' ineens l `When such engagement has been e'ieced, so tlieniiei: e. given setting oit the machine, sections oi? ecciu'utely vuniform lengths will be cuii iiiointlie tubing'.

liei'einbeieie Stated, the machine of the present invention is generally like tliui dieand iney be-assoeiatedwitli @tune forming niueliine to ieeeive the tubing' deliveed there- Jl'- )in und eut the seine into pi'edetei'in-ined lengths or, if deeied, it may employed es u eepeiate ent-ity to which lengths of tubing muy be ijed by any other ineens.

` The. ,machine involves u bese l upon `which i u1 j ineu'nted side imine 2, 2 connected` bye eioes girder 3, and Secured tethetopei" tlie eide i'ijen'ie is i longitudinal bei' 5, preferably eqnui'e interese section, upen wvliieli'tlie trip mechanism and ce1-tain :recesso-rice ure inoiuited. l

donneled in the side iiiulnes, above the linee, ieu drivetslneitj vliieli muy be diiven e Vby u suitulole` inc tei', not Shown, Said eliiui'ft Sectional de- @n the o-utboei'dend-oit the Shaft. 6 ie iiiied e dLivingl gesti, E21 eo? ueeted by reducing 'und 23, jouineled lontlie stuli sluiit "a1 to 'the sideiieine 2, with a leijgelgezui if; :ulanted to be Connected with theelieit 920 lo drive the letterbyinezine enball cluteli et etsuiduad type, vwhich is conventionally' ilf luetifuted in' Fig.V l, one of the elutcli, ineinbeije einn y ing); clutch ineinbei v27 keyed tothe slieit 20,

with the ball shifting; plate l28, inteipe'eed betweenV the elements 26 und 27, beingpiof vided ivitll'i a radial lug,` 29 on its periphery,

which lug: when engegedfbye stop 0i' detent, will eiigect t Seemed in the upper vpait el the inaeliiine liaine is e longitudinal Shaft 10,"uponwhich i mounted or'roeking movement a saw cui-v l in the liuli ci' the gear 25, tlie niet ryiner frame or yoke comprising a tubular mem er 11 and bracket arms 12 and 13, in which latter is journalled a saw arbor 14 driven at a constant speed by pulley 15 and belt l8. Splined to the arbor 14 so as to rotate therewith, but slidable longitudinally of the arbor, is a collar 17 carrying a circular cutting saw 16, which is, therefore, mounted for transverse and parallel movements relative to the travel of the tubing through the machine, as in the machine of the patent aforesaid. j j Secured to the shaft 2O is a cam 30, Which cooperates with a roller 32 on the end of a lever 31, which latter controls the movement of the saw carrying frame or yoke toward and from the tubing, the projecting of the saw, toward the tubing being effected by means of the lift rod 37 actuated by compression spring 36, said rod being connected to lever arm 35, which is formed as an integral part of the hub by means of which lever 31 is mounted on shaft 10, the arm 35 having a jaw 34 adapted to engage a jaw 33 attached to the sleeve member 11 of the saw frame or yoke.

Secured to a transverse shaft 4 journaled in bearings on one of the side frames 2 is a rock arm 41 carrying roller 43 which engages cam 30. Also secured to the shaft 4() is a rock arm 42, which, with the rock arm 41, consti-V tutes a bell crank, the outer end of the arm 42 being connected by pull rod 44 through 'a pin 45 to a rocker arm 46, which latter is provided, at its lower end, with an integral sleeve 47 Vjournaled on the pintle48 carried by the cross girder 3.` Also as an integral part of the sleeve 47 is an arm 48, which is connected by retractile spring 49 with one of the side frames 2, said spring normally tending to swing arm 48 into engagement with a stop lug 50 on the cross girder 3. j

Pivotally connected to the lower end of the rock arm 46 by the same type of joint as shown and described in the Seymour patent aforesaid, is a lever 51 having a forked upper end 53 which straddles the saw carrying vframe or yokeand is engaged with the annular groove in the hub 17 which carries the saw,the forked end of the lever 51 being connected to the hub by the usual pin and collar construction'54, which permits the saw to rotate while the lever 51 partakes of the movement of the saw longitudinally of the arbor during the cutting operation. The connection between the fork 53 of the lever 51 and the hub of the saw is provided with an upward extension 54', as indicated in Figs. 1 and 7. i

The swinging arm 46 is provided at its upper end with an abutment which engages lever 51 to return the latter and the saw to its initial position. Also mounted on the upper end of the arm 46 isa stop lug 46 adapted to A, .move under pivoted latch 55 secured to the under side of the sleeve 11 of the saw carrying frame or yoke to temporarily lock the arm 46, when it is moved out of engagement with lever 51, as described in the patent aforesaid.

Attached to the lever 51 is a strap 57, which is adapted to be taken up by spring drum 56 mountedon the cross girder 3, the spring drum serving through the strap connect-ion to the lever 51 to move the latter during the cutting operation and thereby take the load of the saw and its associated parts 0E of the tubing during the cutting operation, as eX- plained in the patent aforesaid.

The construction and operation of the maf chine as thus far described is substantially identical with the disclosure in the Seymour patent, except the particular arrangement of the clutch and the driving gearing interposed between shafts 6 and 20, which, in the present instance, are mounted on the outside or outer face of oneof the side frames 2and,there fore, more accessible for adjustment and reair. Y Slidably mounted on the bar 5 and fixed in adjusted position thereon byl a set screw, or similar device, is a frame 60 on which is mounted a vertical pin 62 upon which is pivoted a swinging frame 63, the lower edge of Y holds the dog 67 in engagement with a stop Y lug or pin 69 on the frame'60. This arrangement of swinging frame and trip plate is generally the same as that shown in the Seymour patent and the operation thereof is substantially identical with the latter.

Connected to the frame 63 is a swinging arm 70, which is connected by a swivel joint 71, with pull rod 72, the outer end of which is supported in a guide bracket 73 attached to the bar 5. .The other end of the pullrod 72 is connected to a rock arm 76 formed integrally with a sleeve 75 j ournaled on a pin 74 fixed in a bracket73, which is mounted upon bar 5. A second rock arm 76 is formed on sleeve 75, the lowerend of rock arln 7 6 being connected by a link 7 8 to therock ar1n79 formed integrally with the sleeve 8() mounted Von a stud extension of the bracket'73, said with the lug 29 on the clutchyplate 28Vand i thereby disengage the clutch members.

Also formed as an integral part of the sleeve 75 isa rock arm 90, in the lower end 'of hinge connection 90 and to the other member ol" Which is secured pull rod 91 connected to a horizontal lever V92 pivoted at 93 on the bar 5, the lever 92 having fixed thereon an upstand ing stop lug or pin 94 adapted to cooperate with a swinging latch 95 pivoted on the eX- tension 5st ot the connection between the toi-k of rock lever 51 and the hub 17 of the saw, these partsbeing so'arranged that the initial swinging movement of the Aarm 90 engages the lug or pin 9d With the latch 95 and thereby locks the saw to the swinging `trame 62 through the connected instrumentalities, to Wit, latch 95,'lug9i, lever 92, link 91, rock arm 90, `sleeve 75, rock arm 76, pull rod 72, arm 70 and frame 63. Thepurpose o'l this coordination is to provide a iiXed and definite distance between the saw 16 and thetarget 0r trip plate 65 'when thesaiv enters the tube in the' initiation of thev cutting operation, the engagement ofthe pin 94' With the latch 95 to lock the saw to the trame of the trip device being effected immediately after the clutch members 26 and 27 havebeen engaged to start the rotation of shaft 20 and cam 30,

which permits theyoke ortrame carrying the saw to be swung by its spring actuated means to project the sau'` `into the path of travel ot Vthe tubing.

In order to lioldtlie saw trame in its ad'- justed position during the cutting operation, there is provided a latch member pivoted to abracket 101 carried by the bar 5, said latch having a shoulder 102 on its forward end adapted to drop behind a square bar 103 mounted on the side ot the bearing bracket 12 oit the sawframe, so that, when the latter is' swung to project the saw into cutting position, the shoulder ot the latch drops behind the vertical face of the bar 103 and'holds the frame inV its adjusted position against the tension of the spring 58 connected to the bracket 101 by an adjustable eye bolt 59. In order to release'the lateh`100 and permit the Vsaw frame or yoke to be returned to its initial position after the cutting operation,4V a novel torni ot trip plate is provided :t'or lifting the latch out ot engagement with the bar 105l as itollowsf Pivoted on a stud 108 onthe inner face of the bracket 12 is a lever 107, the lovver end ot' lwhich is pinned. to a rod 104,'the outer end of `which is guided in' an eye 105 termed on the sleeve member 11 ot the saw trame, said rod having thereon an adjustable stop 106, secured to the rodbyset screw 106, which stop 106 is adapted to be engagedby one arm of `the fork 53 of the rock arm 51,

after the cutting operation has been com-v pleted,` thereby sliding the rod 104 longitudinally of the sleeve member 11 et the saiv traine and rocking lever '107 Whichlatter is provided with a right angle extension 109 in the outer end et which is secured an adjust-` able sierenv stud 110, which engages the underl side of the latch 100 and liftsftheilatter out of engagement with the barlOS, thereby permitting the spring 58 toswing the saw trainefor yoke to Withdraw the sau7 out of the path of movement et the tubing. f l

lt found neiessary at times to suspend finger 120 'is in its inoperative positionivhere it isfarrested by 1119123 engaging the side iframe. When the linger 120 is swung vin 'be-k hind the bracket member 12 oi thesaivjt'rame, the swinging movement ot the latteruncler influence t spring actuated rod 37 isarrested and the saw is not projected into the path ot movement ot the tubing.

. Ain order to accurately gaugethe length ot the sections to be, cut from the tubing,the bar 5 is'provided with a scale 116 With which registers a pointer carried bythe slide upon which the swinging frame y63 j isv mounted. v f i In order to accommodate tubes .of diilerent diameters, the machine is provided with an adjustable support for the tubing, as

illustrated. in l'igs.V 2.and`3, the same ycoinprising a V-shaped or trough-like member llcarried by a` bracket 130, yWhich latter is adjustable vertically and laterallyl With relspectto the saw by means ot bolts 134, .which `pass through vertical slots 132 in the bracket and liorizonal slots 133 in the lateral extension of the side traine;

. The operation of the machine asr described is as tolloivs: rhe rtubing. is ied into the machine, either trom the mandrel o'l' a tube making machine orby any other appropriate feeding device, and. accurately guided through the lmachine by the supporting means 131Which has been properly adjusted to the particular size olV thertubing. As the advance endY oi thetubing encounters Twith an, operatin handle 122 by nie-ans the target or trip plate G5, it moves the trip plate and the verticallyipivotediirame 63 as a unit and the swinging movement ot the tra-me causes link 7 0 tomove pull rod 72 in the directionotmovement oi" the tubing. The initial movement of rod `72 'swings the arm 76 and the-sleeve 7 5 oit which the same forms apart. The partial rotation ot the sleeve y'l' 51 rocks lever 76,`Which, through link -78 and rocknrm 79 onsleeve 80, causesthe nger or paivl 81 to litt rod 82thereby rocking stop lug 86 out ot engagement With the lug 29 on the clutch plate 28, permitting the two members of the clutch to become engaged and iso start the rotation of shaft 20. The continued upward movement of the finger 81 frees the latter from the hooked end 83 of the lift rod 82 and the latter drops and rocks the stop 86 down to be in position to engage the stop lug 29 on the clutch plate after the shaft has made one complete revolution, and thereby disengages the clutch members. Immediately after the clutch members have been engaged and the shaft has started its rotation, the rocking motion of arm 90 moves the stop lug or pin 94 carried by the horizont-al swinging lever 92 into locking engagement with the latch 95 carried by the extension 54 of Vthe connection between the swinging lever 51 and the hub 17 of the saw, thereby locking the saw to theV trip mechanism, including the swinging frame 63 and the trip platex65 and accurately fixing the length of the section i of the tube to be cut, as determined by the distance between the triplplate 65 and the saw, which distance will be fixed and determined for each adjustment of the trip mechanism, so that the lengths of all of the tube sections cut will be uniform. The initial rotation of the shaft 20 carries the high part of cam out of engagement with the roller 32 on the lever 31, thereby permitting the spring actuated rod 37 to rock lever35, and

thereby rock the frame or yoke which carries the saw arbor 14 toswing the saw into the path of travel `of the tubing. At the same time, the roller 43 engaging the Cain, rocks arm 41 and connected lever 42'to swing rock lever 46 to the left, as shown in Fig. 1, against the tension of spring 49, which is connected to thel companion lever 48, the stop lug 46 on the upper end of lever 46 snapping behind the pivoted detent on the under side ofthe saw frame, so that said lever 46 is out of the path of movement of the lever 51, which has a swivel connection with the liub 17 of the saw. This permits the lever 51 to move with the saw, which latter has been engaged with the tubing, and this swinging movement of level 51 is effected, without'imposing any strain on the tubing, by means of the spring motor 56 and the strap 57 in the ymanner and for the purposes explained in the Seymour patent aforesaid. The advance of the tubing, after the same has been engaged by the saw, swings the frame 63 and the trip plate 65 secure thereto until the arni 66 on the shaft 64 of the trip plate passes out of engagement withV the pendent arm of the dog 67, thereby permittingl `the. trip plate.

to rock on its axis until the lower edgev of the Y plate engages the upper sideof the travelling tubing.

cutting operation, one arm of the forked end 53 of the swinging lever 51 engages the stop lug 106 on rod 104, moving said rod in the direction of travel of the saw, thereby swingl ing lever 108 so that the adjustable bolt 110 lcarried `by said arm lifts the latch 100 out After the saw has completed the of engagement with the squared rod or lug 103 on the bracket 12 of the saw frame, thereby permitting the spring 58 to swing the saw frame to its rearward position anddisengage the saw from the tubing. When the severed section of the tubing is discharged, the trip plate 65 swings back to its normal position, tilting the latch 67 and finally snapping under the latter intolocked position. As the saw is swung into engaging relation with the tubing,ltlie latch 95 carried by the saw slides out o f enga, ,rement` with the pin 94 and all of the parts are then ready to be returned to initial vposition upon completion of the cutting operation. The return rocking movement of the saw frame disengages latch 55 from the lug 46 on the swinging lever 46 and the latter is started in its return movement by spring-49 actingthrough lever 48, the upper end of rock lever46 engaging lever 51, which slides the saw along its arbor to its initial position. The final portion of the rotation of shaft 20 causes the high part of the cam 30 to again engage the roller 32 on lever 31, thereby rocking lever 35 and forcing rod 37 downward against the tension of spring 36. As stated, whenV` the shaft 20 has `ctnnpleted a single rotation, the lug 86 engages the stop lug 29 on the clutch plate 28, separating the clutch members andstopping f the rotation of the shaft. In order to prevent to an extension of the frame at one end and to an adjustable anchorage on the slide 60, shown in Fig.

That we claim is: j j

l. A tube cutting machine comprising means for guidinga travelling tubing, a saw mounted for transverse and parallel movements relative to the travel of fthe tubing, means operative to project the saw into engagement with the tubing, a displaceable element engaged by the forward end of the tubin g to initiate the operation of said projecting means. and releasable means for temporarily locking said. element to the saw during the projecting movement of the latter.

2. .A1 tube cutting machine comprising means for guiding a travelling tubing, a saw ments relative` to the travel of the tubing,

means operative-to project t-he saw into en-.

giiageinent with the tubing,a displaceable elementto the saw during the projecting move- Vso ment engaged by the forward end, of the tubment of the latter andto liinloclrsaid element at the completion of the projectingmovement.

3. A tube cutting machine Vcomprising means for guiding a` travelling tubing, a saiv VmechanismV including a clutch connection With said shaft, a`r trip mechanism operated by the tubing to engage theclutch members to.'

transmit motion from the shaft vto the saw tubing.

projecting mechanism, andmeans for teinpodriven shaft, mechanism operative to project the saw into engagement with the tubing said mechanism including a clutch o connection Withsaidshaft, a tripmechanismoperated by the tubing kto; engage the clutch members to transmit motion i'romthe shaft to the` savv projecting mechanism, a latch carried bythe saw, and a detent actuated by thetripmechanism to engage the latch andloclr thesaw to the trip mechanism until the sawenters the 5. A tube cutting machinev comprising means for guiding a travelling tubing, a saw having a movable support, mechanism operative to project the saw into engagement with the tubing, means controlling the operation of the saw proj ecting mechanism, a trip` mechanisin comprising a swinging frame mounted for movement about a vertical axis and connected With said controlling means, a plate attached to said yframe Aand normally positioned to be engaged by the moving tubing Yto move the frame andthereby operate said controlling means to release the saw projecting mechanism, andl means actuated by Vthe trip vmechanism for locking the sauftheretountil the saw enters the tubing. f j

6. A tube cutting machine comprising means torguiding a .travelling tubing, a saw liavinga movable` support, mech anism operative to project the saw into engagement with thetubing, means controlling the operation ot' the saw projecting mechanism, a trip mechanism comprising a swingingv 'frame mounted 'for movement about a vertical axis and connected With said controlling means, a plate attached to said .frame and normally positioned to be engaged by the moving tubing to move the :trame and thereby operate said controlling means to release the saw projecting mechanism, a latch carried by the saw and adetent actuated by the trip mechanism to engage the latch and lock the saw to the trip device until the sau7 enters the tubing.

7. A tube cutting machine comprising means for guiding a travelling tubing, a savv having a movable support, a lever operatively A4connected to thefsayv support, means normallytending to actuatesaid lever 'to'proj ect the saw .intol engagement with the tu ing,l a rotatable cam engaging saidlever and .nor-

mally holding the sameagainstaction of its actuating means, means Jfor rotating the cam tto release the lever bythe action of its actuating means, a trip li'nechani,sm controlling said cam rotating means, and ynieansv `actuated bythe operative movement of the trip'inechanism orloclringthe saw to said trip-,mechanism until the sawv enters the tubing.

8. tube ,cutting machine ,CQmpl-lsmg means for guiding ajtrav'elling tubing, a saw vhaving a moi/'able support, alever operatively` connectedl to the saw support, ,mean'snor- Y inally tending fto actuate'v said lever to 4lpro'- ject the sawinto engagement `with the tubing,

a rotatable cam engaging said lever and norl -mally holding the same against vaction ofits actuatingmeans,.means for rotatingthe cam to vrelease the lever bythe action of itsactuj ating means, a trip mechanism controlling` saidjcam rotating means, a`,latch carried 'by' the saiv,jand a Adetent Aactuated by the trip mechanism to engage Vthe latch and flolclt the sawto the trip mechanism until the s aivlenters themtubing j f I l V9- A tube @att-insignias@ Qeiiirljisiiis means for guiding-a travelling hing' Y able support haring an arboijo j c in and a sleeve carrying a lsaiy slidable on said arbor,l `mechanism for moving the'support to proj ect the saw into engagement Withtlie tubing, a displaceable element engaged by the forward end ofthe tubing toinitiate the operation of said projecting means, and means for locking the said elementtojthe saw during the proj ect-ing movement of the latter; l n n NIO. A tube Vcuttinov machine comprising, means for guiding atravell'ing tubing, fa mov.-

' ablesupport'having an varbor journaled thereinand a sleeve carrying a saw slidable on sai-d arbor, mechanism for moving lthe support to project the saw intoengagement With the tubing, a displaceable'element engaged `bythe forward end ofthe tubing torinitiate the/operation kot" saidprojecting means, a`

vertical axis and controlling the operation of l theprojecting mechanism, a plate attached V to said trame and normally positioned` to be engaged bythe end of the moving tubing to move the frame and thereby initiate the operproject the saw into engagement with the tubing, a trip mechanism comprising a swinging frame mounted for movement about a vertical axis and controlling thev operation of the projecting mechanism, ra plate attached to said frame and normally positionedto be enaged by the end of the moving tubing to move therame and thereby initiate the operation of .the projecting mechanism, a swinging latch carried by the saw, and a detent connected to and actuated by the swinging frame to lock the saw to the frame while the saw is being projected toward the tubing.

13. A tube cutting machine comprising means for guiding a travellingJr tubing, a movable support having an arbor journaled therein4 and a sleeve carrying a saw slidable on said arbor, mechanism for moving the sup port to project lthe saw into engagement with the tubing, a trip mechanism comprising a swinging frame mounted for movement about a vertical axis and controlling the operation of the projecting mechanism, a plate attached to said frame and normally positioned to be engaged by the end of the i moving tubing to move the frame( and thereby initiate the operation of the projecting mechanism, a swinging latch carried by the saw, an arm pivoted to the machine frame, a detent on said arm cooperating with said latch, and connections between said arm and the swinging frame, whereby the operativeV movement of the latter effects the engagement of the latch with the detent to lock the saw to the frame while the saw is being projected toward the tubing.

j 14. A tube cutting machine comprising means for guidingsa travelling tubing, a pivoted yoke having an arbor ,journaled therein and a sleeve carrying a saw slidable on said arbor, means normally operative to move the yoke away from engagement with the tubing, trip controlled mechanism operative to turn the yoke to project the saw into engagement with the tubing, a latch operative to hold the yoke with the saw in its projected position, a lever pivoted at one end to the machine frame and engaging at its other end the sleeve carrying the saw, a bell crank pivoted to theyoke having one arm cooperating with said latch, and a pull rod slidably mounted on said yoke and having an adjustable'lug thereon to be engaged by the pivoted lever at the end of the cutting Operation to swing the bell crank and free the latch from locking engagement with the yoke. Y

15. A tube cutting machine comprising means for guiding a travelling tubing, a pivoted yoke having an arbor journaled therein, a saw slidable on the arbor, spring actuated means for swinging the yoke to project the saw into engagement with the tubing, means comprising clutch and cam mechanisms controlled by the travel of the tubing to release the spring actuated mechanism, and a stop pivoted to the machine frame and adapted to be projected into the path of movement Vof the yoke to arrest the movement of the fsaw j toward the tubing.

16. A tube cutting machine comprising means for guiding a travelling tubing, a pivoted yoke having an arbor journaled therein,

a saw slidable on the arbor, spring'actuated means for swinging the yoke to project the saw into enagement with the tubing, means comprising clutch and cam mechanisms controlled by the travel of the tubing to release the spring actuated mechanism, a shaft journaled on the machine frame adjacent one end of said yoke, anda stop lug fast to said shaft and adapted upon turning of the shaft to engage the yoke and arrest the saw projecting movement thereof. V

In testimony whereof we aix our signatures.

HENRY DE SMITH. `DENNIS CHURCH. 

